Smoke isn't as bad as some of you guys think, although his is a little much, most of the time a turned up motor like that will hardly puff at all when driven "Normally". I don't like people who smoke around a lot of traffic, it hurts the diesel community otherwise I could care less how much it smoked. An explorer owner on another forums claims 30+ MPG with his 4bt sploder. Plenty of fullsize dodge cummins with 600+ HP are capable of 20+ MPG highway... It would look better with a single stack too. After watching the video again, his truck doesn't smoke that much, notice it clears up just fine when it spools, the large clouds are caused by him intentionally lugging it.